OEM Carrier Transformer 40VA 120V to 24V for Model FY4ANF024005AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified step-down transformer for the Carrier FY4ANF024005AAAA fan coil air handler. The transformer converts 120V line voltage to the 24V AC signal required to power the control board, thermostat, and all low-voltage control circuit components. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the system will not respond to calls for heating or cooling, and no fault codes will display because the board itself has no power to operate.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01CN241 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: This OEM transformer is wound to exact Carrier specifications, ensuring stable 24V output under full load. Generic transformers may sag under load, causing intermittent lockouts, erratic thermostat behavior, and premature control board failure.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before disconnecting. Verify output voltage with a multimeter after installation before closing the panel.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed by 3PM local time ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FY4ANF024005AAAA fan coil air handler. Always verify your unit's data plate voltage requirements match 120V primary / 24V secondary before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before your purchase — same-day shipping means you're back up and running fast.